--- scheme-data.texi.~1.30.~	2003-06-07 10:16:33.000000000 +1000
+++ scheme-data.texi	2003-06-07 10:16:53.000000000 +1000
@@ -802,8 +802,9 @@
 @end deftypefn
 
 For @code{floor} and @code{ceiling}, the equivalent C functions are
address@hidden and @code{ceil} from the standard mathematics library
-(which also take and return @code{double} arguments).
address@hidden and @code{ceil} from the standard mathematics library,
+which also take and return @code{double} arguments (@pxref{Rounding
+Functions,,, libc, GNU C Library Reference Manual}).
 
 
 @node Scientific